diff --git a/monty/shutil.py b/monty/shutil.py
index a68cba847..ef88db51c 100644
--- a/monty/shutil.py
+++ b/monty/shutil.py
@@ -55,7 +55,7 @@ def gzip_dir(path: str | Path, compresslevel: int = 6) -> None:
     for root, _, files in os.walk(path):
         for f in files:
             full_f = os.path.abspath(os.path.join(root, f))
-            if not f.lower().endswith("gz") and not os.path.isdir(full_f):
+            if not f.suffix.lower() == ".gz" and not full_f.is_dir():
                 with open(full_f, "rb") as f_in, GzipFile(f"{full_f}.gz", "wb", compresslevel=compresslevel) as f_out:
                     shutil.copyfileobj(f_in, f_out)
                 shutil.copystat(full_f, f"{full_f}.gz")
@@ -76,7 +76,7 @@ def compress_file(filepath: str | Path, compression="gz") -> None:
     filepath = Path(filepath)
     if compression not in ["gz", "bz2"]:
         raise ValueError("Supported compression formats are 'gz' and 'bz2'.")
-    if not filepath.lower().endswith(f".{compression}"):
+    if not filepath.suffix.lower() in (f".{compression}"):
         with open(filepath, "rb") as f_in, zopen(f"{filepath}.{compression}", "wb") as f_out:
             f_out.writelines(f_in)
         os.remove(filepath)
@@ -96,7 +96,7 @@ def compress_dir(path: str | Path, compression="gz") -> None:
     path = Path(path)
     for parent, _, files in os.walk(path):
         for f in files:
-            compress_file(os.path.join(parent, f), compression=compression)
+            compress_file(Path(parent, f), compression=compression)
 
 
 def decompress_file(filepath: str | Path) -> str | None:
@@ -155,6 +155,6 @@ def remove(path: str | Path, follow_symlink=False) -> None:
     elif path.is_symlink():
         if follow_symlink:
             remove(os.readlink(path))
-        os.unlink(path)
+        Path.unlink(path)
     else:
         shutil.rmtree(path)